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Flow structure and heat transfer in a square duct fitted with dual/quadruple twisted-tapes: Influence of tape configuration

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Abstract

Numerical prediction is reported of thermohydraulic characteristics of square ducts equipped with dual and quadruple twisted tapes (DTs and QTs) with different configurations. The studied cases include (1) dual co-tapes (Co-DTs), (2) dual counter-tapes (C-DTs), (3) diagonal dual counter-tapes (C-DDTs), (4) diagonal dual co-tapes (Co-DDTs), (5) quadruple co-tapes (Co-QTs), (6) quadruple counter-tapes (CC-QTs) and (7) quadruple counter-tapes (PC-QTs). The results of these cases are compared with those of a smooth duct (a duct without tape insert) and also the one with a single tape (ST). The prediction involves using the RNG k-ε turbulent model under constant wall heat flux condition in the turbulent flow regime for the Reynolds number ranging from 6000 to 14000. The prediction indicates that thermohydraulic characteristics in ducts with twisted tape are strongly dependent on number and configuration of tapes. However, the influence of tape number is more significant than that of tape configuration. Heat transfer and friction increase as tape number increases. QTs offer superior heat transfer to DTs but their thermal performance factors are lower. For the tape inserts determined, DTs with diagonal configuration (Co-DDTs and C-DDTs) is the best design as the tapes offer the best thermal performance. The highest thermal performance factors given by Co-DTs, Co-DDTs, C-DTs, C-DDTs, Co-QTs, PC-QTs and CC-QTs, are around 1.21, 1.35, 1.25, 1.38, 1.08, 1.18, and 1.22, respectively.

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Authors and Affiliations

  1. Department of Mechanical Engineering, Faculty of Engineering, Mahanakorn University of Technology, Bangkok, 10530, Thailand

    S. Eiamsa-ard & W. Changcharoen

Authors
  1. S. Eiamsa-ard
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  2. W. Changcharoen
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Corresponding author

Correspondence to S. Eiamsa-ard.

Additional information

Recommended by Associate Editor Dae Hee Lee

S. Eiamsa-ard is an Associate Professor of Mechanical Engineering at Mahanakorn University of Technology (MUT), Thailand. He obtained his D.Eng. in Mechanical Engineering from King Mongkut’s Institute of Technology Ladkrabang in 2006. He has been working at MUT since 1996. His research interests include Thermal&Fluid engineering, heat transfer enhancement and computational fluid dynamics.

W. Changcharoen is an Assistant Professor of Mechanical Engineering at Mahanakorn University of Technology (MUT), Thailand. He received the D.Eng. at King Mongkut’s Institute of Technology Ladkrabang in 2012. His current interests include heat transfer enhancement for jet impingement, channel with rib/baffle turbulators and CFD.

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Eiamsa-ard, S., Changcharoen, W. Flow structure and heat transfer in a square duct fitted with dual/quadruple twisted-tapes: Influence of tape configuration. J Mech Sci Technol 29, 3501–3518 (2015). https://doi.org/10.1007/s12206-015-0748-z

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  • DOI: https://doi.org/10.1007/s12206-015-0748-z

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